@MomofThreepcWRT OK,let’s take this step-by-step.
1. Disconnect all cables (LAN, WAN, power cord). Router should be off. Keep it off for at least 30 seconds.
2. Connect ONLY the power cable. Wait for about 2 minutes. Which lights are on? Solid or blinking? I’m expecting that SYS should be on (solid). WAN should not be on since no cable is connected.
3. Use a pin or pen tip, press and hold the WPS/Reset button for 10 seconds, then release.
4. Wait for about 20 seconds. Did the all LEDs flash once at the same time? Is the router rebooting?
P.S. in steps 2-4 above, do not disconnect the power cable.